Expansible cutter-head.



N0. 69!,19]. Patented-Jan; l4, I902.

5. s. smmm. EXPANSIBLE CUTTER. HEAD.

(Applicatioh. filed Nov. 8, 1901. (No Model.) 2 Sheets-Sheet I.

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Nu. 69I-,|9l. Patented Jan. l4, I902. E58. SHIMEB.

EXPANSIBLE CUTTER HEAD.

(Application filed Nov 8, 1901. (No Model.) 2 Sheets-$heai -2.

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Arnivr FFICE.

ELMER S. SHIMER, OF MILTON, PENNSYLVANIA.

EXPANSIBLE CUTTER-HEAD.

SPEGJZFIGATIQN forming part of Letters Patent No. 691,191, dated January 14, 1902.

Application filed November 8,1901. Serial No. 81,623. (No model.)

To all whom, it may concern;

Beit known that I, ELMER S. SHIMER, a citizen of the United States, residing at Milton, in the county of Northumberland and State of Pennsylvania, have invented new and useful Improvementsin Expansible Cutter-Heads,of which the following is a specification.

My invention relates to expansible cutterheads of the Shimer type; and the object of the same is to construct expanding means for the same, which means shall be simple in construction and efficient in operation. This object is attained by the novel construction described in this specification and claimed, and illustrated in the accompanying drawings, forming a part thereof, in which Figure 1 is a side elevation of my improved head expanded. Fig. 2 is a vertical longi tudinal section of the same. Fig. 3 is a detail elevation of the adjusting-nut. Fig. 4 is a bottom view of the same. Fig. 5 is a detail of the upper end of the hub of the section B. Fig. 6 is a section on the line 6 6, Fig. 5.

Like characters of reference designate like parts in the different views of the drawings.

My cutter-head comprises two principal sections,(designated A and B.) The section A has a hollow hub 1, bearing a radially-extending flange 2, provided with bit-seats 3. The hub 1 is eXteriorl y screw-thread ed at t throughout a portion of its length. The second section B comprises a hollow hub 5 and a flange 6. The flange 6 has bit-seats 7 formed therein and guides '7, which engage the flange 2. The hub 5 snugly fits over. the hub 1 and is mounted to slide thereon. A ledge 8 is formed within the upper endof the bore of the hub 5. A split spring-ring 9, bearing a pawl 10, is mounted on this ledge and is designed to engage radial equidistant beveled notches 11, formed on the bottom of an adjusting-nut 12, mounted on the threaded portion 4 of the hub 1. The nut 12 has a shoulder 13 thereon, which abuts the top of the hub 1. Just below this shoulder 13 is a circumferential groove 14, which, in combination with an interial groove 15, cut in the hub 5 just above the ledge 8, forms a raceway for a set of balls 16. The balls 16 are inserted through an aperture 17 in the hub 5, which aperture is normally closed by a screw-plug 1S.

By the above-described arrangementof the grooves and balls 16 the hub 5 and the adjusting-nut 12 are coupled together in sucha manner that the nut is left free to turn independent of the hub, which is given a motion of translation thereby. The spring-pawl-lO serves to prevent the accidental displacement of the nut 12 and to make its movement more positive.

In adjusting my cutter head to get the properdistance between the bits mounted in the seatsiiand 7 the nut 12 is turned, by means of a spanner, until the required interval is secured, and then left standing with the pawl 10 engaging one of the notches 11.

Having thus described my invention, what I claim as new, and wish to secure by Letters Patent, is-

1. In an eXpansiblecutter-head, a firstsection having a hub, exteriorly screw-threaded throughout a portion of its length, a second section having a hub slidiugly mounted on said hub and having a ledge formed within the bore thereof a. beveled spring-pawl mounted on said ledge, and adjusting-nut mounted on the said threaded portion of said hub and having a series of beveled notches therein 10- cated to be engaged by said pawl, and a series of balls mounted in a raceway formed in said adjusting'nut and said hub on said second section tocouple them together, substantially as described.

2. In an expansible cutter-head, a first section having a hub exteriorly screw-threaded throughout a portion of its length, a second section having a hub slidingly mounted on said hub, and having a ledge and a groove formed in the interior of the bore, a springpawl mounted on said ledge, an adjusting-nut mounted on said thread ed portion of said hub, and having a series of beveled notches therein located to be engaged by said pawl, and a groove located to cooperate with said groove in said hub to form a raceway, and a series of balls mounted in said raceway, substantially as described.

In an expansible cutter-head, a first section having a hub exteriorly screw-threaded throughout aportion of its length, a second section having a hub slidingly mounted on the hub of said first section, an adjusting-nut mounted on said threaded portion of said first section and bearingaseries of beveled notches,

means for coupling said second section and said adjusting-nut leaving the nut free to turn independent of said second section, and a pawl mounted on said second section and located to engage the said notches on said adjusting-nutto hold said nutagainst accidental displacement, substantially as described.

4. In an expansible cutter-head, a first sec tion having a hub exteriorly screw-threaded throughout a portion of its length, a second section havingahub slidingly mounted on the hub of saidfirst section and having a groove therein, an adj usting-nut mounted on the said threaded portion of said first section, and having a series of beveled notches and a groove nesses.

ELMER S. SHIMER.

Witnesses:

EDWIN PAUL, GEO. W. HAAG. 

